We can think of plenty of reasons not to, but creator [Jia Xun Chai] thought it would be somehow motivating to see the seconds tick irretrievably ... time left on the clock. Answer these questions ...

What time is it? Let’s ask the clock. What time is it? It says ‘tick-tock’. What time is it? Let’s find out What it’s all about. Tick-tock goes the clock, Tick-tock goes the clock.

Before LEDs became cheap enough to be ubiquitous, flip-card displays were about the only way to get a digital clock. These entirely electromechanical devices had their own charm, and they have a ...